Reliability of tidal-level forecasting is essential for structure installation and human activities in the marine environment. This paper reports an application artificial neural network with back-propagation procedures accurate forecast variations. Unlike conventional harmonic analysis, this model forecasts time series tidal levels directly using a learning process based on set previous data. Two sets field data diurnal semidiurnal tide, respectively, were used to test performance model....

Abstract Waves reflecting obliquely from structures establish short‐crested waves which are conducive to scour of the bed adjacent them. The pore pressures and effective stresses induced by this wave system derived analytically for an unsaturated, anisotropic soil matrix infinite depth in a three‐dimensional domain. Verification is available solutions being readily reduced two‐dimensional cases progressive standing wave, some closed‐form available. It shown that obliquity coupled with...

The hydrodynamic performance of the wave power extraction an innovative modified breakwater-integrated Oscillating Water Column (OWC) energy converter is both numerically and experimentally presented in this study. OWC device comprises a non-conventional perforated wall front typical chamber. air-water two-fluid model, considering fluid compressibility involved FLOW-3D solver, employed for numerical simulations characteristics devices. are first validated by experimental measurements with...

Sandy bay beach in static equilibrium is the only physiographic feature that could remain stable without sediment supply a persistent swell environment anywhere around world. With continuing trend of erosion to sandy beaches worldwide, conservative and practical hypothesis not consider mobile dynamic wave parameters but safeguard against under vanishing future. To achieve this, an empirical shape equation strongly recommended as one best coastal management options. Combining with MEPBAY,...

Detached breakwaters are widely used for shore protection. The planforms of tombolos or salients behind structures have also been to provide a recreational and sustainable coastal environment. In this study, the comprehensive XBeach model was numerically simulate evolution wave transformation, nearshore current, morphological changes in tombolo detached breakwaters. Given various gap spacings between consecutive breakwaters, numerical results indicated that both equilibrium bay-shaped...

The velocity characteristics of a solitary wave shoaling in the prebreaking zone and near breaking point are investigated experimentally. study focuses on near-bottom boundary layer flows 1:10 slope, with incident steepness varying from 0.133 to 0.384. Both flow visualization technique (FVT) thin-layered dye as well particle image velocimetry (PIV) high-speed camera were used. Results FVT reveal that laminar occurs not only during phases, but also postbreaking run-up run-down phases....

Abstract. A coupled wave–vegetation simulation is presented for the moving effect of coastal vegetation on tsunami wave height damping. The problem idealized by solitary propagation a group emergent cylinders. numerical model based general Reynolds-averaged Navier–Stokes equations with renormalization turbulent closure using volume fluid technique. object (GMO) developed in computational dynamics (CFD) code Flow-3D applied to simulate motion dynamically. damping and kinetic energy along...

This paper reports experimental results of the toe scour seawall on a steep seabed with slope 1:5 under action breaking waves. The equilibrium profiles were investigated and depths scours related to wave parameters analyzed. Experimental indicated that depth increased as steepness incoming increased, but decreased an increase in water at toe. breaker types front investigated. due plunging is larger than spilling or nonbreaking seawall. down-rush flow velocity induced from rundown was also...

Microbial-induced calcium carbonate precipitation (MICP) has the potential to be an environmentally friendly technique alternative traditional methods for sustainable coastal stabilization. This study used a non-pathogenic strain that exists in nature experimentally investigate application of MICP on mitigating sandy beach erosion. First, unconfined compressive strength (UCS) test was adopted explore consolidation performance sand after treatment, and then model tests wave flume were...

A standing wave in front of a seawall may reach height more than twice its incident component. When excess pore pressure occurs, it even induce seabed instability, hence endangering the structure. This issue was studied previously using only linear theory. In this paper, standing-wave theory to second-order approximation is applied, order demonstrate differences between these two solutions. The spatial and temporal variations instantaneous are first calculated, addition their vertical...

Abstract. In this study, artificial neural networks, including both multilayer perception and the radial basis function are applied for modeling forecasting maximum time variation of storm surges at Tanshui estuary in Taiwan. The physical parameters, local atmospheric pressure wind field factors, finding surges, first investigated based on training networks. Then network models series accordingly developed using major meteorological parameters with variations. six typhoons were used testing...